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B. G. ATKINS.

FURNAGE FUR HEATING SAWS.

No. 288,968. Patented Nov. 27, 1883.

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UNITED STATES PATENT thrice.)

nLtAs c, ATKINS, or INDIANAPOLIS, INDIANA.

FURNACEIOR H EAT! NG SAWS.

SPECIFICATION forming part of Letters Patent No. 288,968, dated November2'7, 1883,

- Application filed July 5,1882. (No modeLl To all whom it may concern:

Be it known that I, ELIAS O. ATKINS, of the city of Indianapolis, countyof Marion, and State of Indiana, have invented certain new and usefulImprovements in Furnaces for Heating Saws, of which the following is aspecification.

The object of my said invention is to produce a convenient andeasily-operated furnace for heating saws for tempering purposes duringthe process of manuiacture, which objectis accomplished by theconstruction and or rangement hereinafter more specifically set forth.

Referring to the accompanying drawings, which are made a part hereof,and on which similar letters of reference indicate similar parts, Figure1 is a horizontal sectional viewof my improved furnace as seen whenlooking downwardly from the dotted line 2 c; Fig. 2,

a central vertical section thereof on the dotted line y y; and Fig. 3, asectional view, looking to the right from the dotted line a:

In said drawings, the portions marked A represent the fire-space of myimproved furnace; B, a twostoried revolving table located centrally insaid furnace; C, an arched cover over the space in which the saw is torest; D, a device for covering the saw completely when desired, and Ethe door through which the saws are inserted.

The fire-space A is simply the ordinary firespace of a reverberatoryfurnace, the walls surrounding which, as well as the walls of the entirefurnace, being constructed of brickwork lined with firebrick in theordinary manner. The fines and other-passages for the products ofcombustion are marked, respectively, a c a a c a a and the course ofsaid products of combustion is indicated by the arrows in Fig. 2. i

The revolving table Bis mounted upon a vertical shaft, B, which isprovided with a pulley or gear-wheel, b, by which said table isrevolved. The upper floor of this table is sustained by the columnsb,which rest upon the lower floor thereof, and may be either of ironcoated with some fire-proof substance or of fire-brick. The spacesbetween said columns and floors form the passage of for the products ofcombustion, which, during their passage, the saw laid thereon byradiated heat. In stead of two floors, one of which shall be separatedflOllL the other by columns, as shown, a single floor formed of thickhollow castings (preferably sectors of the floor) might be em ployed,and the products of combustion would then pass through these openingsand produce substantiallythe same effect as where two separate tablesare employed.

The arch 0 covers the revolving table completely, and causes theproducts of combustion on their return through the passage (0 to passvery near the saw-plate lying on said table.

It is usually desirable that the saw shall be heated wholly by radiatedheat, and for this reason I provide the movable cover 1), which israised up by means of a lever or otherwise, and the saw slipped underthe same, and then lowered again to the position shown in the drawings.When, for any reason, it is desired to dispense with this cover, it canbe removed through the same door, E, through which the saw-plates areremoved and inserted.

The operation of my furnace is as follows: The saw plate to be heatedisinserted through the doorway E of the furnace, and placed in positionon the revolving table B. The door E of the furnace is then closed, andthe table is caused to revolve slowly by means of any suitable powerapplied to the shaft B. As before stated, when it is desired to useradiated heat only, that result is obtained by the use of the cover 1).

As will be readily understood, the continual revolving of the tablesecures a perfectly even heating of the saw, which is the greatdesideratum in tempering such articles, and the flame passing over andunder the upper floor prevents any considerable warping of the sawplatewhile being heated.

Having thus fully described my said invenr heat said upper floor, andthus heat I tion, what I claim as new, and desire to secure by LettersPatent, is-

l. The combination, in a sau lieating furnace, of the fire-space A, therevolving table B, the arch O, and the passages c a a ct* a a a", by.which'the products of combustion are conducted underneath that floor ofthe table IOU on which the saw rests, and back over the top of the saw,and mechanism whereby the table is continually revolved, saidseveralpartsbe- In witness whereof I havehereunto set my 10 ingarrangedand operating substantially as hand and seal, atIndianapolis,Indiana, this set forth. 30th day of June, A. D. 1882. r

2. The combination, in a furnace, of the firespace A, revolving table13, arch O, loose 1'e- ELIAS O. ATKINS. [L. s.]

movable cover D, and the various passages for the products ofcombustion, all substantially In presence of as shown and described, andfor the purpose 0. BRADFORD, specified.

CHAS. L. THUR'BER.

